0,0 → 1,67 |
Clear=0.175; // size of tolerance zone |
thickness = 2; // global wall thickness |
height = 15; // height of one screen element |
screen_radius = 75/2; // outer radius of screen |
tube_radius=30/2; // inner radius of the space for a sensor |
screen_bevel = 10; // bevel of outer screen wall |
num_ribs = 3; // number of holding ribs |
cap_radius = screen_radius * 1.5; |
inner_ring_thickness = thickness *2; |
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angle_sep = 360/num_ribs; |
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cap_height = cap_radius - sqrt(cap_radius*cap_radius - (screen_radius - screen_bevel)*(screen_radius - screen_bevel)); |
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difference () { |
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union() { |
//cap outer shell |
intersection () { |
translate ([0,0,-cap_radius + height + cap_height]) |
sphere(cap_radius, $fn=100); |
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//screen outer shell |
cylinder (h=screen_radius*(height/screen_bevel),r1=screen_radius ,r2=0,$fn=100); |
} |
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// cap hook |
translate ([0,0,height + (cap_height-thickness)]) |
difference () { |
cylinder (h=height/2,r1=screen_radius/4,r2=screen_radius/4 - thickness,$fn=100); |
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translate ([0,screen_radius/4,2.5]) |
rotate ([90,0,0]) |
cylinder (h=screen_radius/2,r=3, $fn=100); |
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translate ([-screen_radius/4,0,2.5]) |
rotate ([0,90,0]) |
cylinder (h=screen_radius/2,r=3, $fn=100); |
} |
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} |
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union() { |
intersection () { |
//cap inner cavity |
translate ([0,0,-cap_radius + height + cap_height ]) |
sphere(cap_radius-thickness, $fn=100); |
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//screen inner cavity (height is solved by triangle similarity) |
translate ([0,0, -Clear/2 ]) |
cylinder (h=(screen_radius - thickness)*(height/screen_bevel),r1=screen_radius - thickness ,r2=0,$fn=100); |
} |
} |
} |
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// center ribs |
for (i = [0 : (num_ribs-1)]) { |
rotate ([90,0,angle_sep * i]) |
translate ([0,0,-thickness/2]) |
linear_extrude (height = thickness, convexity = 10) |
polygon(points=[[0, cap_height + height],[tube_radius + thickness - Clear, 0],[screen_radius - thickness,0],[screen_radius - screen_bevel - thickness,height]]); |
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} |